alleles are variations in dna sequence

Historically identity testing in the forensic field started with the analysis of the ABO blood group system. Later new markers for identity and paternity identification were based on variations of serum proteins and red blood cell enzymes.


Variation And Polymorphism In Dna Basicmedical Key

Eventually the human leukocyte antigen system was used It was not until 20 years ago that Sir Alec.

. DISCOVERY OF THE DNA FINGERPRINT. The Y chromosome is one of two sex chromosomes in therian mammals including humans and many other animalsThe other is the X chromosomeY is normally the sex-determining chromosome in many species since it is the presence or absence of Y that determines the male or female sex of offspring produced in sexual reproductionIn mammals the Y chromosome.


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